{"version_information": {"version": "det_AHW_tail10.0_v1.2", "compiled_date": "2026-06-27 18:34:50.142731", "data_source": "ERA5", "website": "http://wexa.jamstec.go.jp", "Author": "Patrick Martineau"}, "event_id": {"name": "Event ID", "description": "A unique identifier based on: beginning_date, end_date, longitude, and latitude", "value": "2023-Apr-10_to_2023-Apr-13_227.0_55.0"}, "event_label": {"name": "Event label", "description": "Integer-valued grid identifier that uniquely labels each detected extreme event in space and time, consistent with the corresponding labels stored in the NetCDF dataset.", "value": 2023040000463}, "status": {"name": "Status", "description": "An ongoing event denotes an event that lasts up to the latest data available. These events are subject to change as newer data is added.", "value": false}, "start_date": {"name": "Start date", "description": "First date on which grid points are under the influence of an event", "value": "April 10 2023"}, "end_date": {"name": "End date", "description": "Last date on which grid points are under the influence of an event", "value": "April 13 2023"}, "duration": {"name": "Duration", "description": "Time elapsed (days) from the start date to the end date", "value": 4}, "figures_available": {"name": "Figures available", "description": "True if figures were pre-generated for this event", "value": true}, "detection_var": {"name": "Detection variable", "description": "Variable used for the detection scheme", "value": "t2m"}, "event_type": {"name": "Event type", "description": "Type of the event detected", "value": "Cold spell"}, "area": {"name": "Area", "description": "The area (in square meters) encompassing all grid points under the influence of an event during its lifetime.", "value": 52230.20589795291}, "countries_affected": {"name": "Countries affected", "description": "The ArcGIS geocoding API (https://developers.arcgis.com/rest/geocode/) is used to obtain a list of all the countries affected by an event during its lifetime.", "value": ["United States"]}, "IPCC_regions": {"name": "IPCC regions", "description": "List of all IPCC regions affected", "value": ["N.W.North-America"]}, "continents_affected": {"name": "Continents affected", "description": "List of all continents affected", "value": ["North America"]}, "oceans_affected": {"name": "Ocean basins affected", "description": "The ArcGIS geocoding API (https://developers.arcgis.com/rest/geocode/) is used to obtain a list of all the ocean basins affected by an event during its lifetime.", "value": ["North Pacific Ocean", "The Coastal Waters of Southeast Alaska and British Columbia"]}, "center_lat": {"name": "Center latitude", "description": "Latitude of the maximum time-integrated standardized t2m anomalies. Only t2m of the same polarity as the events are considered (positive T2m for a HW, for instance). The centre is thus representative of both the severity and persistence of anomalies.", "value": 55.0}, "center_lon": {"name": "Center longitude", "description": "Longitude of the maximum time-integrated standardized t2m anomalies. Only t2m of the same polarity as the events are considered (positive T2m for a HW, for instance). The centre is thus representative of both the severity and persistence of anomalies.", "value": 227.0}, "center_latf": {"name": "Center latitude", "description": "Formatted version of center longitude", "value": "227.0\u00b0E"}, "western_lon": {"name": "Westernmost longitude", "description": "Westernmost longitude affected by event", "value": 221.75}, "eastern_lon": {"name": "Easternmost longitude", "description": "Easternmost longitude affected by event", "value": 227.25}, "southern_lat": {"name": "Southernmost latitude", "description": "Southernmost latitude affected by event", "value": 54.25}, "northern_lat": {"name": "Northernmost latitude", "description": "Northernmost latitude affected by event", "value": 57.25}, "polygons": {"name": "Polygons", "description": "Polygon vertices describing the boundary of the event at each time step", "value": {"2023-04-10T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[-138.75, 57.0], [-138.53, 57.53], [-138.0, 57.75], [-137.75, 57.65], [-137.5, 57.75], [-137.0, 57.54], [-136.5, 57.75], [-135.97, 57.53], [-135.82, 57.18], [-135.75, 57.15], [-135.5, 57.25], [-135.25, 57.15], [-135.0, 57.25], [-134.47, 57.03], [-134.32, 56.68], [-133.97, 56.53], [-133.82, 56.18], [-133.47, 56.03], [-133.32, 55.68], [-133.25, 55.65], [-133.0, 55.75], [-132.47, 55.53], [-132.25, 55.0], [-132.47, 54.47], [-133.0, 54.25], [-133.25, 54.35], [-133.5, 54.25], [-133.75, 54.35], [-134.0, 54.25], [-134.3, 54.38], [-134.47, 53.97], [-135.0, 53.75], [-135.25, 53.85], [-135.5, 53.75], [-135.75, 53.85], [-136.0, 53.75], [-136.53, 53.97], [-136.68, 54.32], [-137.03, 54.47], [-137.25, 55.0], [-137.15, 55.25], [-137.25, 55.5], [-137.15, 55.75], [-137.18, 55.82], [-137.25, 55.85], [-137.5, 55.75], [-138.03, 55.97], [-138.18, 56.32], [-138.53, 56.47], [-138.75, 57.0]]]]}, "2023-04-11T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[-138.75, 57.0], [-138.53, 57.53], [-138.0, 57.75], [-137.75, 57.65], [-137.5, 57.75], [-137.0, 57.54], [-136.5, 57.75], [-135.97, 57.53], [-135.82, 57.18], [-135.75, 57.15], [-135.5, 57.25], [-135.25, 57.15], [-135.0, 57.25], [-134.47, 57.03], [-134.32, 56.68], [-133.97, 56.53], [-133.82, 56.18], [-133.47, 56.03], [-133.32, 55.68], [-133.25, 55.65], [-133.0, 55.75], [-132.47, 55.53], [-132.25, 55.0], [-132.47, 54.47], [-133.0, 54.25], [-133.25, 54.35], [-133.5, 54.25], [-133.75, 54.35], [-134.0, 54.25], [-134.3, 54.38], [-134.47, 53.97], [-135.0, 53.75], [-135.25, 53.85], [-135.5, 53.75], [-135.75, 53.85], [-136.0, 53.75], [-136.53, 53.97], [-136.68, 54.32], [-137.03, 54.47], [-137.25, 55.0], [-137.15, 55.25], [-137.25, 55.5], [-137.15, 55.75], [-137.18, 55.82], [-137.25, 55.85], [-137.5, 55.75], [-138.03, 55.97], [-138.18, 56.32], [-138.53, 56.47], [-138.75, 57.0]]]]}, "2023-04-12T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[-138.75, 57.0], [-138.53, 57.53], [-138.0, 57.75], [-137.75, 57.65], [-137.5, 57.75], [-137.0, 57.54], [-136.5, 57.75], [-135.97, 57.53], [-135.82, 57.18], [-135.75, 57.15], [-135.5, 57.25], [-135.25, 57.15], [-135.0, 57.25], [-134.47, 57.03], [-134.32, 56.68], [-133.97, 56.53], [-133.82, 56.18], [-133.47, 56.03], [-133.32, 55.68], [-133.25, 55.65], [-133.0, 55.75], [-132.47, 55.53], [-132.25, 55.0], [-132.47, 54.47], [-133.0, 54.25], [-133.25, 54.35], [-133.5, 54.25], [-133.75, 54.35], [-134.0, 54.25], [-134.3, 54.38], [-134.47, 53.97], [-135.0, 53.75], [-135.25, 53.85], [-135.5, 53.75], [-135.75, 53.85], [-136.0, 53.75], [-136.53, 53.97], [-136.68, 54.32], [-137.03, 54.47], [-137.25, 55.0], [-137.15, 55.25], [-137.25, 55.5], [-137.15, 55.75], [-137.18, 55.82], [-137.25, 55.85], [-137.5, 55.75], [-138.03, 55.97], [-138.18, 56.32], [-138.53, 56.47], [-138.75, 57.0]]]]}, "2023-04-13T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[-133.0, 55.75], [-132.47, 55.53], [-132.25, 55.0], [-132.47, 54.47], [-133.0, 54.25], [-133.53, 54.47], [-133.75, 55.0], [-133.53, 55.53], [-133.0, 55.75]]]]}}}, "max_amp": {"name": "Maximum anomaly amplitude", "description": "Maximum t2m anomaly recorded over entire duration", "value": -3.219374252736884}, "mean_amp": {"name": "Mean anomaly amplitude", "description": "Mean t2m anomaly over entire duration", "value": -2.1043632904180014}, "evo_areamean": {"name": "Evolution of mean t2m", "description": "The daily evolution of mean t2m.", "value": [2.9682975841224106, 3.3509806322506392, 4.061782706461827, 3.7576472716907006]}, "evo_maxamp": {"name": "Evolution of maximum t2m", "description": "The daily evolution of maximum t2m.", "value": [1.954453813419775, 2.1611334807079743, 2.4293082755446562, 3.7576472716907006]}, "anom_evo_areamean": {"name": "Evolution of mean t2m anomalies", "description": "The daily evolution of mean t2m anomalies.", "value": [-2.5224388948394694, -2.219067353621667, -1.5800224622856907, -1.8511981056333298]}, "anom_evo_maxamp": {"name": "Evolution of maximum t2m anomalies", "description": "The daily evolution of maximum t2m anomalies.", "value": [-2.850598988886304, -3.219374252736884, -1.9058655466359937, -1.8511981056333298]}, "anom_scaled_evo_areamean": {"name": "Evolution of mean standardized t2m anomalies", "description": "The daily evolution of mean standardized t2m anomalies.", "value": [-2.1919277381853988, -1.95880059551004, -1.388403617979934, -1.4497153859728196]}, "anom_scaled_evo_maxamp": {"name": "Evolution of maximum standardized t2m anomalies", "description": "The daily evolution of maximum standardized t2m anomalies.", "value": [-2.68569266459905, -2.4995661051618163, -1.4987127791651838, -1.4497153859728196]}}